docs: def url(self):
          """
          Returns the URL for the current transformation, which can be used
          to retrieve the file. If security is enabled, signature and policy parameters will
          be included
  
          *returns* [String]
  
          ```python
          transform = client.upload(filepath='/path/to/file')
          transform.url()
          # https://cdn.filestackcontent.com/TRANSFORMS/FILE_HANDLE
          ```
          """
          return utils.get_transform_url(
              self._transformation_tasks, external_url=self.external_url,
              handle=self.handle, security=self.security, apikey=self.apikey
          )